LM1875 Amp Power Supply


Here’s a picture of the lm1875 amp power supply.
A typical arrangement was used. 4x MUR860 to rectify the 18+18v transformer secondaries, filtered with a 2200uF Nichicon capacitor and 10nF 1000v  philips cap in parallel. Next to that a simple RC snubber network was installed (10R + 10nF). All this makes a well filtered +-24V perfect to feed both LM1875.

The transformer used is made by Avel Lindberg UK, 18+18v Secondary, 250VA (more than enough for both lm1875 circuits). Choosing a good transformer is really important in these kind of amps. as it is proper filtering. I chose it toroidal instead of laminated for its very low stray magnetic field
The enclosure will fit everything together without much space between transformer and components, so I wanted to make sure that no noise was being inducted by the transformer.


~ by fperezroig (22nanofarads.com) on February 26, 2013.

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